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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31330a1dae6e202b92302a54b8c180ca8b5580f03275b4a4b6d61ca4f34de3ea' 
  AND token = 'VaIGsbifBYTIasOjRb3/TtmrWFj4x9/+N5xX/k2kMYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}